Is it just me or do these approaches seem hacky? If you were using something like Angular or React wouldn't you plug into lifcycle events that are exposed by the library like Abgular's OnInit?
if you were using something like Angular or React to manage your full page, then by all means run with it! RSJS is an alternative to that that's more suited for "traditional" sites rendered on the server (eg, traditional Rails and Rails-like setups).